#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int n = 0;
	//scanf("%d", &n);
	int i = 0;
	int rut = 1;
	int num = 0;
	for (i = 1; n <=10; i++)
	{
		rut = 1;
		for (i = 1; i <= n; i++)
		{
			rut = rut * i;
		}
		num = num + rut;
	}
	printf("%d\n", num);
	return 0;
}